Kim was in a "deteriorating relationship" with the owner of the home, John Petrella, 39, and had apparently gone to the home to confront him, he said.

Petrella was on the phone with his sister when he told her he had been shot and hung up, Biniewicz said. His sister contacted police, he said.

When police arrived at the home, they found Kim and Petrella, who had suffered a gunshot wound in the left leg. Both were taken to Alexian Brothers Medical Center in Elk Grove Village, where Kim died.

Petrella was released, has been cooperating and has given a statement to police, Biniewicz said.

Police and DuPage state's attorney investigators are trying to corroborate Petrella's statement with evidence, Biniewicz said. Police are treating the shooting as a "death investigation," he said.

"We're waiting to submit some physical evidence to our crime lab prior to making a final determination," Biniewicz said.

Police found a .357-caliber Smith & Wesson handgun that belonged to Kim at the home, Biniewicz said. The gun had three bullets in it, and police found more ammunition and the gun's box at Kim's home, Biniewicz said.